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DS12C887

Name: DS12C887
Rating: 4.7 (12 reviews)

IC RTC CLK/CALENDAR PAR 24EDIP

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規格

Part Status	Obsolete
DigiKey Programmable	Not Verified
Type	Clock/Calendar
Features	Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output
Memory Size	113B
Time Format	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd
Interface	Parallel
Voltage - Supply	4.5V ~ 5.5V
Voltage - Supply, Battery	2.5V ~ 4V
Current - Timekeeping (Max)	15mA @ 4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Mounting Type	Through Hole
Package / Case	24-DIP Module (0.600", 15.24mm)
Supplier Device Package	24-EDIP
Base Product Number	DS12C887

概述

Description

DS12C887 is a Dallas Semiconductor (now Maxim) CMOS Real-Time Clock/Calendar IC for embedded systems. It keeps time and date, even when main power is off, via a battery-backed domain (often with a trickle-charge option). It uses a serial interface (I2C-like) to read/write time, date, control and status registers. Key features include:
- Timekeeping and calendar (seconds, minutes, hours, day of week, date, month, year) with 12/24-hour support and BCD data.
- Optional battery-backed RAM for small data storage.
- Alarm and periodic interrupt outputs to wake or trigger events.
- Requires a 32.768 kHz oscillator input.
- Suitable as a drop-in RTC for microcontrollers, SBCs, and portable/embedded electronics.
Applications include time stamping, scheduling, data logging, and other time-sensitive tasks. Check the exact variant for RAM size and interface details to ensure compatibility with your MCU’s driver.

Features

DS12C887 features (RTC with battery-backed RAM and 2‑wire interface):
- I2C-like two‑wire serial interface for easy microcontroller communication.
- Real‑time clock/calendar: time (seconds, minutes, hours), day of week, date, month, year; supports 12/24‑hour modes and leap-year correction; century flag.
- Two independent alarm functions with programmable masks.
- Interrupt/square‑wave output: programmable square‑wave or alarm interrupt output.
- 32.768 kHz crystal oscillator input for timekeeping accuracy.
- Battery-backed operation: maintains time and RAM contents on power loss; power‑fail detect with automatic switchover.
- On‑chip nonvolatile RAM for user data retention during battery backup.
- Low power consumption suitable for battery-powered systems.
- Available in common packages (e.g., DIP-28, SOIC).
Note: Specific RAM size, exact alarm modes, and square‑wave options vary by revision; consult the datasheet for exact register map and electrical characteristics.

Package

DS12C887 is a 28‑pin RTC IC. It’s commonly available in DIP‑28 (through‑hole) and SO‑28 (surface‑mount) packages.

Pinout

Pin count: 28 pins (DIP‑28/SO‑28).
Function: CMOS real-time clock/calendar with nonvolatile RAM (RTC/NVRAM) used to keep system time across power cycles and provide timekeeping (seconds, minutes, hours, date, month, year) plus related alarm/timer features.

Manufacturer

- Manufacturer: Dallas Semiconductor (DS).
- What kind of company: An American semiconductor company that designed and manufactured integrated circuits (memory, timing/real-time clocks, analog/mixed-signal ICs). It was acquired by Maxim Integrated (and is now part of the Analog Devices family).

Application

DS12C887 is a real-time clock/calendar with battery-backed RAM, used for reliable, low-power timekeeping and nonvolatile data storage. Common applications include:
- Embedded systems and microcontroller designs
- PCs/servers for system time, alarms, and wake-up
- Industrial automation for time stamping, scheduling, and data logging
- Data-logging meters and instrumentation
- Telecom/network equipment for event logging
- Consumer electronics and appliances needing calendar/alarm features
- Battery-backed backup timing in various devices

Equivalent

Equivalent parts to DS12C887 (RTC with NVRAM) include:
- Dallas/Maxim DS1287A / DS12887
- Intersil/Renesas ISL1208 / ISL1209
- STMicroelectronics M41T00 / M41T01 / M41T02
- NXP PCF8583 / PCF8563
- Microchip MCP7940N / MCP7941X
Note: not all are pin-compatible; choose by interface (I2C/SPI) and RAM size to match your design.